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Passive solar thermosyphon air panels were retrofitted to five existing houses. The panels utilise ducts formed by the joist space in the first floor and ceiling to transfer warm air from the panels to the house. Computer modelling was used to optimise panel design. Each installation was monitored. Panel efficiencies were on average approximately 30%, but significantly less at low values of incident radiation. Mean solar energy collected was 155 kWh/m2 providing energy savings representing between 4.4% and 17.2% of the annual heating load. On-site, cold draughts from the panels necessitated modifications to the design. Changes to the control system were identified which could improve performance and reduce manufacturing costs. It was concluded that costs relative to fuel prices would have to be at least halved before the system could be adopted commercially.

Additional information

Authors: JOHNSON P, Wimpey Laboratories Limited, Hayes, Middlesex (GB)
Bibliographic Reference: EUR 12110 EN (1989) FS, 38 pp., ECU 5
Availability: (2)
ISBN: ISBN 92-825-9785-7;CD-NA-
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